Seasonal variation of statistical indices for Liaoning province: (a) <i>CC</i>, (b) <i>ME</i>, (c) <i>MAE</i>, (d) <i>POD</i>, (e) <i>POFD</i>, (f) <i>ETS</i>.

<p>Each point represents value of accuracy index for one season in a given year. All daily data belonging to each season in one year is pooled together to calculate each index across this region, respectively.</p>